2. Heterochromia

A person with heterochromia would be hard to miss because this condition causes people to have two (or more) different colors in their eyes! Also known as heterochromia iridis and heterochromia iridium, it is a harmless condition that could be a congenital effect or even has resulted from injury or illness.
According to Healthline, “It’s also possible for small segments of the same iris to be different colors. For example, half of your left eye could be blue and a half could be brown.”